Effects of stream channel morphology on golden trout spawning habitat and recruitment

  • Published source details Knapp R.A., Vredenburg V.T. & Matthews K.R. (1998) Effects of stream channel morphology on golden trout spawning habitat and recruitment. Ecological Applications, 8, 1104-1117.


This study is summarised as evidence for the following.

Action Category

Other biodiversity: Exclude grazers

Action Link
Mediterranean Farmland
  1. Other biodiversity: Exclude grazers

    A replicated site comparison in 1994 in meadow streams in Inyo National Forest, California, USA, found fewer California golden trout Oncorhynchus mykiss aguabonita nests in part of a stream with a livestock exclosure, and fewer nests in narrower, deeper streams. Fish: Fewer trout nests (redds) were found in part of stream with a livestock exclosure, compared to part without a livestock exclosure (0 vs 52 nests; 0 vs 0.42 nests/m2), in the Upper Ramshaw Creek. In Mulkey Creek, fewer trout nests were found in narrow streams, compared to wide streams (0 vs 0.27 nests/m2), and grazer exclusions were associated with narrower streams in this area, in previous studies. Methods: Trout nest density was measured in narrow (45–125 m) and wide (53–130 m) stretches of streams (five replicates each) in Mulkey Creek. In the Upper Ramshaw Creek, nest density was measured inside (upstream) and outside (downstream) of a livestock exclosure. Nests were surveyed six times between 1 May and 5 June.


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